I have the most annoying rattle coming from my Magnaflow cat back, it was always quiet while stock , however, now the damn thing rattles so hard it overpowers the lope of the cam, you can put your foot on the drivers side tail pipe and it goes away but I can't seem to make any head way in fixing it under the car. Was just wondering who else has this problem with a Magnaflow cat back? I have 1 3/4 Kooks LT's and a Kooks O/R Y also.
Thanks,
Jeff
__________________ 2002 Artic White Camaro SS M6. SLP Lid, High Flow Filter, Smooth Bellow, Pro 5.0 shifter, Magnaflow c/b, Livernois Stage 3 CNC'd heads, Livernois Stage 2 Cam 232/232 .595/.595 114LSA, 92mm FAST intake and PTM t/b 95mm combo from Texas Speed, SLP U/D Pulley, 85mm ZO6 MAF, JP Double Roller Chain, Kooks 1 3/4" headers, Kooks o/r Y pipe, tune, Nitto DR's Tuned by Speed Inc. 462rwhp/416rwtq
It's probably the over-axle portion making a little contact somewhere. Jack it up, get underneath, and see where it's touching. Loosen up some of the clamps, tweak it, and tighten it up.
__________________ 1998 Camaro Z28
2007 TrailBlazer SS
My friend Dave's 98 Z28 has this rattle as well. I agree with the above posts. I know his Over-Axle Pipe is very close to the Panhard Bar and most likely the cause. I believe if we loosen his ORY and slide it toward the back of the car, away from the headers, just a bit, will give it a little more clearance and hopefully eliminate the rattle. Hopefully we can get this taken care of this winter.
Mine "rattles" but its a high pitch squeak around 1800-2000k rpms when Im just cruising. Ive tried freaking everything under the sun and cant figure it out. Im about to change out all the rubber hangers. Its not touching anywhere either.
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SLP Lid, SSRA, Magnaflow Quad catback, MGW Shifter; Strano springs and Koni 4/4s just waiting to get installed
weird. i dont have any rattles and my ypipe is touching my floorboard and i have no other rattles. maybe try tightening things down under there and moving them around like mentioned about and you should be fine.
I am with Bbalr, I have been under the car and adjusted things 3-4 times and still get that high pitched squeak and rattle about the same RPMS he is talking about.....I am going to try several more things if it doesn't work by spring I may just sell the c/b and the O/R Y and go with a true dual set up......does anyone have a audio/video clip of a cammed LS1 with true duals dumped before the axle?
__________________ 2002 Artic White Camaro SS M6. SLP Lid, High Flow Filter, Smooth Bellow, Pro 5.0 shifter, Magnaflow c/b, Livernois Stage 3 CNC'd heads, Livernois Stage 2 Cam 232/232 .595/.595 114LSA, 92mm FAST intake and PTM t/b 95mm combo from Texas Speed, SLP U/D Pulley, 85mm ZO6 MAF, JP Double Roller Chain, Kooks 1 3/4" headers, Kooks o/r Y pipe, tune, Nitto DR's Tuned by Speed Inc. 462rwhp/416rwtq
Im having a similiar issue with my c/b. Its rattling against the heat shield over the axle ive tried to bend the heat shield and it only works for a little while. This weekend I'm going to try to adjust the catback when I throw my headers in or put a couple self tappers in the heat shields to secure them outta the way.
__________________ 1966 Mustang long tubes, true duals, holley 350,detroit locker, all original otherwise. Grandpa left it to me
2001 MRM firebird shorty headers, shaved lid, hotchkiss stb, 3.42 posi. SOLD
2002 z28 pewter,BBK LT's, ORY, MAC catback, TB bypass, bump stop mod, MTI lid,SLP air filter, P&P TB.
Mine used to rattle and it turned out to be the welds on one of the hangers that was broken. Took it to the shop and they welded it again and it was good to go.
I can get it to squeak if I shake it side to side but not if I do it up and down. There are no rub marks at all on the exhaust or the car and Ive even had it up on ramps and climbed under it to see if I can find out what is causing it.
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SLP Lid, SSRA, Magnaflow Quad catback, MGW Shifter; Strano springs and Koni 4/4s just waiting to get installed
Haha, oh yeah I know where that is...I went to school at the U of Iowa, I am originally from the very Southeastern tip of Iowa, place called Keokuk.
Keokuk, huh. Yeah, I know where that is. I used to have GF that had family from there. Although that quite a while ago. Thats about as South and East in Iowa as you can get. LOL.
Good luck with your rattle, man. I'll let you know how the one on Dave's Z works out.
yea i have this bad. seems to happen when i let off the gas.. and i think that something is touching because it sounds like i have a bit of drone at 1500 rpm ill have pics up in a bit.
I have a slight rattle but I haven't climbed under to see what its hitting yet. I think it may be hitting the panhard bar. Mine is not as bad as some of you have described it though.
Magnaflow C/B Exhaust Rattle, who has it? 
, however, now the damn thing rattles so hard it overpowers the lope of the cam, you can put your foot on the drivers side tail pipe and it goes away but I can't seem to make any head way in fixing it under the car. Was just wondering who else has this problem with a Magnaflow cat back? I have 1 3/4 Kooks LT's and a Kooks O/R Y also.
